diff --git a/pkg/analyzer_cli/lib/src/build_mode.dart b/pkg/analyzer_cli/lib/src/build_mode.dart
index d9ca97a..c50528d 100644
--- a/pkg/analyzer_cli/lib/src/build_mode.dart
+++ b/pkg/analyzer_cli/lib/src/build_mode.dart
@@ -195,7 +195,7 @@
   PackageBundleAssembler assembler;
   final Map<String, UnlinkedUnit> uriToUnit = <String, UnlinkedUnit>{};
 
-  final bool buildSummary2 = true;
+  final bool buildSummary2 = false;
   final bool consumeSummary2 = false;
   final Map<String, ParsedUnitResult> inputParsedUnitResults = {};
   summary2.LinkedElementFactory elementFactory;